Sand-drier.



Ilm-730,086. PATENTEDJUNE2,1903.-

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iNITED STATES Patented J une 2, 1903. y

PATENT OFFICE.

SAND- DRIER.

SPECIFICATION forming part of Letters vPatent No. 730,086, dated June 2, 1903.-

Application filed February 16,1903. Serial No. 143,714. (No model.) V

My invention relates to improvement-s insand-drying machines, although the machine 1o may be used for drying other loose materialg' and the object thereof `is to produce a simple and economically-operated machine for the purpose. `I accomplish this object by the machine described herein and illustrated in 15 the accompanying drawings, in which Figure l is a side elevation of my improved machine, and Fig. 2 is a cross-section on the line 2 2 of Fig. l.

In the drawings, A is the outer shell of the 2o drying-chamber, within which and secured thereto by spacing-arms B is the inner shell C of the drying-chamber, the space between 'the shells constituting such drying-chamber. To the inner face of the outer shell' and ex- 25 tending the entire length thereof is secured a series of parallel flanges A', which prefer'- ably extend a little beyond the center of the drying-chamber. To the outer face of ther inner shell and extending the entire length 3o of the outer shell is secured aseries of parallel flanges C', which preferably extend alittle beyond the center of the drying-chamber and-- are stepped with relation to the flanges of the outershell. These flanges may be straight The outer shellv of the dryingchamber is supported upon rollers D, mounted in bearings E, affixed to frame F. Annular rings G are secured to the outer shell to form guides with the rollers to prevent 4o the drying-chamber from having any longitudinal motion. To the outer shell is secured a gear-ring H, which'meshes with a gear I, rigidly mounted on shaft J, which shaft is mounted in bearings affixed to the A driving-pulley K is also rigidly ,Wmounted on shaft .I for the reception of a f belt (notvshown) to impartniotion thereto. A hydrocarbon-burner L' discharges fuel into the upper end of the inner shell, and the 5o lower end of the inner shell extends into stack M. The shells of the drying-chamber and the flanges thereof are preferably made of sheet-steel of suitable thickness, and they l are set at the proper slant to cause the travel of the sand from the inlet to the outlet at the desired rate of speed to thoroughly-dry it.

In the operation of my machine the inner shell is thoroughly'heated and power is appliedto rotate the drying-chamber. The sand or other material is then thrown into the lower part of the upper .end of the drying-chamber. The flanges of the outer shell carryvthe sand upward, and as it rises it is gradually deposited on the inner shell, which carries it around to the other side, where it is gradually deposited upon the outer shell, and this process is repeated until the sand finally passes out at the lower end of the drying-chamber next to the stack thoroughly dried and/ready for use. As the chamber is set at an inclination, the sand on each revolution thereof is caused to travel toward the lower end thereof, and itis constantly changing the surface presented to the inner shell, thereby preventing the shell from becoming too highly heated. The flanges of the inner shell also radiate the heat, which helps to keep the shell cool and to dry the sand or other`r material. By this construction a very light machine may be used which has great efficiency in drying sand; that as'the sand or other material is continually passing or dropping from the outer shell tothe inner shell and from the inner shell to the outer shell the adhesion of said sand, caused by the dampness thereof, is overcome, and the moisture escapes in the form of steam through the ends of the dryingchamber; that the sand is not driedin a drying-chamber through which the products of combustion and draft pass, and that all of the line sand. is retained and none of it is drawn up the stack, as is the case when the draft and products of vcombustion pass through the, dryingchamber.

When it is desiredfto use with my sanddrier other fuel than liquid-hydrocarbon fuel,

a furnace N in'which to use coal, wood, coke, or other fuel, maybe used, the products of combustion beingled into the interior cylinder, as shown in dotted lines in Fig. 1.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. A sand-drier comprising a stack; a cylinderinclining downwardly and entering said stack; a second cylinder open at both ends surrounding said first cylinder and secured thereto by spacing-arms; inner flanges secured to said outer cylinder; outer flanges secured to said inner cylinder within said outer cylinder; a frame having rollers therein adapted to support said outer cylinder; and means to rotate said cylinders.

2. A sand-drier comprising a stack; a downwardly-inclined cylinder open at both ends and having its lower end entering said stack; a second cylinder open at both ends surrounding said first cylinder except at the extreme ends thereof and secured thereto by spacingarrns; flanges contacting with and secured lo the inner side of said outer cylinder, flanges contacting with the outer side of the inner cylinder within the outercylinder throughout the entire length of said flanges and secured thereto; said flanges being stepped as to the flanges on the outer cylinder; a frame having rollers adapted to support said outer cylinder; means to rotate said cylinders; a hy drocarbon-burner projecting into the higher end of said inner cylinder.

3. Asand-drier comprisingaframe; a stack; two inclined concentric cylinders, one within the other rotatably mounted in said frame, the inner of said cylinders at its lower end extending into said stack; a hydrocarbonburner projecting into the upper end of said inner cylinder; and means to rotate said cylinders.

In witness that I claim the foregoingl have hereunto subscribed my name this 9th day of February, 1903.

H. W. BOHRMAN.

Witnessesz G. E. I-IARPHAM, MARGARETE C. NICKELEsoN. 

